Yes, it is good. Poor man's lime. Just spread it thin. If you just dump it in a pile it is too much and you won't grow anything there for a while! Spread it thin and all is well. We've done it for 50 years.
I did a lot of research this spring on useing ash to adjust ph. Some major universities are encouraging its use by farmers near wood burning electric plants. They reccomend a couple of tons per acre depending on moisture content. How much will depend also on when you lay it down vs planting. I did`nt save the web addresses but spend some time and you`ll be suprised at what you find.
It is a form of "potash" just like the ash from your fire pit. It will take a double the amount of this over bagged or commerical potash. They also recommend you get a soil test yearly ehen using this stuff.
I have asked this same question due to the price at the time and this is what I was told.
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